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Gemini 3.5 Flash Lite vs GPT-5

Gemini 3.5 Flash Lite leads GPT-5 on coding, 49.0 to 38.8 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 4.0x less per output token ($2.50 vs $10.00 per million). Updated October 21, 2026; 71 benchmarks have a result for both.

Replace Gemini 3.5 Flash Lite Replace GPT-5
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
45
GPT-5OpenAI
Coding
38.8
Overall
51.5
Output $/M
$10.00
26
vs boards won of 71 shared

Gemini 3.5 Flash Lite or GPT-5: which to pick

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 38.8 for GPT-5.

Pick GPT-5 for a lower cost per solved task ($0.39 against $0.41) and work measured by LiveCodeBench (Vals AI) or WeirdML, where it leads.

Model AGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved taskModel BGPT-5OpenAI38.8/1003 independent benchmarks$0.39 per solved task
Shared results
71
Gemini 3.5 Flash Lite only
14
GPT-5 only
42
Like-for-like categories
6 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Gemini 3.5 Flash Lite 49.0 from 3 benchmarks, GPT-5 38.8 from 3 benchmarks.
Widest category
Math, 14.3 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tiers 1 to 3: Gemini 3.5 Flash Lite 26.0% against GPT-5 55.4%, 29.5 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash Lite $2.50 against GPT-5 $10.00 per million output tokens, 4.0x apart.
Context window
Gemini 3.5 Flash Lite takes 1.05M tokens, GPT-5 400K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGemini 3.5 Flash LiteBarsGPT-5Ties
Coding73
Intelligence02
Reasoning77
Math24
Knowledge56
General244
All shared boards4526
CodingLike-for-likeSix of these boards feed the Vibe Coding Index73
Coding benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
Aider polyglotNot measured88.0%Only GPT-5 measured
SWE-bench VerifiedNot measured74.4%Only GPT-5 measured
LMArena WebDev14351418Gemini 3.5 Flash Lite
AA Coding Index49.337.8Gemini 3.5 Flash Lite
LiveCodeBench (Vals AI)79.0%85.9%GPT-5
SWE-bench Verified (Vals AI)75.0%69.0%Gemini 3.5 Flash Lite
Vibe Code Bench (Vals AI)37.2%20.1%Gemini 3.5 Flash Lite
Code migration (Vals AI)6.2%Not measuredOnly Gemini 3.5 Flash Lite measured
ProgramBench (Vals AI)0.0%Not measuredOnly Gemini 3.5 Flash Lite measured
Terminal-Bench 2.1 (Vals AI)50.2%Not measuredOnly Gemini 3.5 Flash Lite measured
CyberBench (Vals AI)59.1%Not measuredOnly Gemini 3.5 Flash Lite measured
LiveCodeBench (Artificial Analysis run)Not measured84.6%Only GPT-5 measured
SciCode41.3%Not measuredOnly Gemini 3.5 Flash Lite measured
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only GPT-5 measured
Terminal-BenchNot measured49.6%Only GPT-5 measured
GSO-BenchNot measured6.9%Only GPT-5 measured
WeirdML39.0%60.7%GPT-5
ALE-Bench765.3807.6GPT-5
LMArena Text: coding14531436Gemini 3.5 Flash Lite
LMArena Text: software and IT14511420Gemini 3.5 Flash Lite
LMArena WebDev: React1408Not measuredOnly Gemini 3.5 Flash Lite measured
LMArena WebDev: HTMLNot measured1427Only GPT-5 measured
LMArena WebDev: from an image1448Not measuredOnly Gemini 3.5 Flash Lite measured
SciCode6.2%0.0%Gemini 3.5 Flash Lite
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
AA Intelligence Index22.223.0GPT-5
Epoch Capabilities Index144.9150.0GPT-5
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index13 boards, none shared
Agentic work benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
AA Agentic Index14.3Not measuredOnly Gemini 3.5 Flash Lite measured
Finance Agent (Vals AI)47.4%Not measuredOnly Gemini 3.5 Flash Lite measured
Tax Agent Bench (Vals AI)7.2%Not measuredOnly Gemini 3.5 Flash Lite measured
Legal Research Bench (Vals AI)13.9%Not measuredOnly Gemini 3.5 Flash Lite measured
Excel Modeling Benchmark (Vals AI)43.2%Not measuredOnly Gemini 3.5 Flash Lite measured
τ²-Bench TelecomNot measured86.5%Only GPT-5 measured
APEX-Agents29.3%Not measuredOnly Gemini 3.5 Flash Lite measured
METR time horizonsNot measured69.6%Only GPT-5 measured
Remote Labor IndexNot measured1.7%Only GPT-5 measured
GDPvalNot measured34.8%Only GPT-5 measured
BALROGNot measured32.8%Only GPT-5 measured
DeepResearch BenchNot measured49.6%Only GPT-5 measured
BrowseComp-PlusNot measured80.0%Only GPT-5 measured
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index77
Reasoning benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
GPQA Diamond83.8%85.6%GPT-5
MMMU Pro (Vals AI)83.6%81.5%Gemini 3.5 Flash Lite
GPQA Diamond (Artificial Analysis run)83.8%85.4%GPT-5
Humanity's Last Exam (Artificial Analysis run)18.8%28.5%GPT-5
GPQA Diamond (Epoch AI run)83.3%86.2%GPT-5
ARC-AGI53.5%65.7%GPT-5
ARC-AGI-210.3%9.9%Gemini 3.5 Flash Lite
SimpleBenchNot measured56.7%Only GPT-5 measured
Chess puzzles21.0%36.0%GPT-5
Mystery game puzzles19.0%23.0%GPT-5
EBR-benchNot measured12.7%Only GPT-5 measured
VPCTNot measured66.0%Only GPT-5 measured
LMArena Text: hard prompts14411415Gemini 3.5 Flash Lite
LMArena Text: expert14341419Gemini 3.5 Flash Lite
LMArena Text: hard prompts in English14401419Gemini 3.5 Flash Lite
LMArena Vision: diagrams12841252Gemini 3.5 Flash Lite
LMArena Vision: homework12911278Gemini 3.5 Flash Lite
Kagi LLM BenchmarkNot measured72.7%Only GPT-5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
AIMENot measured93.4%Only GPT-5 measured
MATH 500 (Vals AI)Not measured96.0%Only GPT-5 measured
MGSM (Vals AI)Not measured92.8%Only GPT-5 measured
AA Math IndexNot measured94.3Only GPT-5 measured
AIME 2025 (Artificial Analysis run)Not measured94.3%Only GPT-5 measured
OTIS Mock AIME71.1%91.4%GPT-5
FrontierMath, tiers 1 to 326.0%55.4%GPT-5
FrontierMath, tier 40.0%22.0%GPT-5
ProofBench13.0%18.0%GPT-5
MATH level 5Not measured98.1%Only GPT-5 measured
LMArena Text: math14341407Gemini 3.5 Flash Lite
LMArena Text: mathematical work14331405Gemini 3.5 Flash Lite
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index56
Knowledge benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
MMLU Pro85.8%86.5%GPT-5
LegalBench (Vals AI)84.1%86.0%GPT-5
CaseLaw (Vals AI)Not measured66.5%Only GPT-5 measured
CorpFin (Vals AI)60.7%61.1%GPT-5
TaxEval (Vals AI)72.6%73.4%GPT-5
MortgageTax (Vals AI)68.7%65.5%Gemini 3.5 Flash Lite
MedQA (Vals AI)Not measured96.3%Only GPT-5 measured
MedCode (Vals AI)43.5%49.6%GPT-5
MMLU Pro (Artificial Analysis run)Not measured87.1%Only GPT-5 measured
SimpleQA VerifiedNot measured50.1%Only GPT-5 measured
GeoBenchNot measured81.0%Only GPT-5 measured
LMArena Text: science14511416Gemini 3.5 Flash Lite
LMArena Text: medicine and healthcare14381413Gemini 3.5 Flash Lite
LMArena Text: legal and government14311431Gemini 3.5 Flash Lite
LMArena Text: business and finance14231400Gemini 3.5 Flash Lite
FACTS Benchmark Suite53.5%56.5%GPT-5
Neither model has a result on the other 2 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
Design Arena: websitesNot measured1184Only GPT-5 measured
Design Arena: UI componentsNot measured1180Only GPT-5 measured
Design Arena: game devNot measured1185Only GPT-5 measured
Design Arena: data vizNot measured1221Only GPT-5 measured
Design Arena: 3DNot measured1056Only GPT-5 measured
Design Arena: all code categoriesNot measured1168Only GPT-5 measured
Design Arena: SVGNot measured1189Only GPT-5 measured
Design Arena: ASCII artNot measured1141Only GPT-5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index244
General benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
Public Benefits Bench (Vals AI)51.8%Not measuredOnly Gemini 3.5 Flash Lite measured
SAGE (Vals AI)47.3%43.7%Gemini 3.5 Flash Lite
MedScribe (Vals AI)70.9%83.7%GPT-5
IFBenchNot measured73.1%Only GPT-5 measured
Long context reasoning (AA-LCR)76.0%78.2%GPT-5
DTBench83.5%90.7%GPT-5
LMCA37.6%40.0%GPT-5
Fiction.LiveBenchNot measured97.2%Only GPT-5 measured
Creative writing (Lech Mazur)Not measured86.0%Only GPT-5 measured
LMArena Text14351406Gemini 3.5 Flash Lite
LMArena Text: instruction following14191388Gemini 3.5 Flash Lite
LMArena Text: creative writing14211365Gemini 3.5 Flash Lite
LMArena Vision12691232Gemini 3.5 Flash Lite
LMArena Text: English14381409Gemini 3.5 Flash Lite
LMArena Text: non-English14271397Gemini 3.5 Flash Lite
LMArena Text: Chinese14681422Gemini 3.5 Flash Lite
LMArena Text: German14541416Gemini 3.5 Flash Lite
LMArena Text: Japanese14261409Gemini 3.5 Flash Lite
LMArena Text: Korean14071360Gemini 3.5 Flash Lite
LMArena Text: French14511409Gemini 3.5 Flash Lite
LMArena Text: Spanish14411399Gemini 3.5 Flash Lite
LMArena Text: Russian14431407Gemini 3.5 Flash Lite
LMArena Text: Polish14371431Gemini 3.5 Flash Lite
LMArena Text: multi-turn14451426Gemini 3.5 Flash Lite
LMArena Text: longer queries14351399Gemini 3.5 Flash Lite
LMArena Text: writing and language14281384Gemini 3.5 Flash Lite
LMArena Text: entertainment and media14141379Gemini 3.5 Flash Lite
LMArena Vision: English12691231Gemini 3.5 Flash Lite
LMArena Vision: Chinese13111267Gemini 3.5 Flash Lite
LMArena Vision: reading text12801246Gemini 3.5 Flash Lite
LMArena Vision: humor12871219Gemini 3.5 Flash Lite
LMArena Vision: captioningNot measured1212Only GPT-5 measured
LMArena Vision: recognizing thingsNot measured1263Only GPT-5 measured
LMArena Vision: creative writing12601210Gemini 3.5 Flash Lite
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 3.5 Flash Lite and GPT-5
BenchmarkGemini 3.5 Flash LiteGPT-5Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3.5 Flash Lite$0.0015Fits in one request
GPT-5$0.0063Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash Lite$0.022Fits in one request
GPT-5$0.092Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash Lite$0.085Fits in one request
GPT-5$0.350Fits in one request

Gemini 3.5 Flash Lite costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3.5 Flash Lite and GPT-5
SpecificationGoogle Gemini 3.5 Flash LiteOpenAI GPT-5
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 21, 2026August 7, 2025
Context window1.05M400K
Input $/Mtok$0.30$1.25
Output $/Mtok$2.50$10.00
Coding index49.038.8
Independent measurements behind it33
Cost per solved task$0.41$0.39
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite better than GPT-5 for coding?

Pick Gemini 3.5 Flash Lite for coding: it scores 49.0 on the Vibe Coding Index against 38.8 for GPT-5. Pick GPT-5 for a lower cost per solved task ($0.39 against $0.41) and work measured by LiveCodeBench (Vals AI) or WeirdML, where it leads.

Which is cheaper, Gemini 3.5 Flash Lite or GPT-5?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; GPT-5 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Gemini 3.5 Flash Lite costs $0.41 and GPT-5 $0.39.

Which has the bigger context window, Gemini 3.5 Flash Lite or GPT-5?

Gemini 3.5 Flash Lite, with 1.05M tokens against 400K.

How many benchmarks is the Gemini 3.5 Flash Lite vs GPT-5 comparison based on?

71 benchmarks have a result for both models as of October 21, 2026. Gemini 3.5 Flash Lite's coding index rests on 3 independent benchmarks and GPT-5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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